navigator.saysWho = (() => {
const { userAgent } = navigator
let match = userAgent.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || []
let temp
if (/trident/i.test(match[1])) {
temp = /\brv[ :]+(\d+)/g.exec(userAgent) || []
return `IE ${temp[1] || ''}`
}
if (match[1] === 'Chrome') {
temp = userAgent.match(/\b(OPR|Edge)\/(\d+)/)
if (temp !== null) {
return temp.slice(1).join(' ').replace('OPR', 'Opera')
}
temp = userAgent.match(/\b(Edg)\/(\d+)/)
if (temp !== null) {
return temp.slice(1).join(' ').replace('Edg', 'Edge (Chromium)')
}
}
match = match[2] ? [ match[1], match[2] ] : [ navigator.appName, navigator.appVersion, '-?' ]
temp = userAgent.match(/version\/(\d+)/i)
if (temp !== null) {
match.splice(1, 1, temp[1])
}
return match.join(' ')
})()
console.log(navigator.saysWho) // outputs: `Chrome 89`As the name implies, this will tell you the name and version number supplied by the browser.
It is handy for sorting test and error results, when you are testing new code on multiple browsers.